Portable reaming and tapping tool



(No Model.)

F. SCHOPF. PURTABLE REAMING AND l'I'APPING TOOL. No. 437,459.

Patented Sept. 30, 1890'.

VUNITED STATES PATENT OFEICE.

FREDERIC SCHOFF, OF PHILADELPHIA, PENNSYLVANIA.

PORTABLE REAMING AND vTAPPING TOOL.

SPECIFICATION forming part of Letters Patent No. 437,459, dated SeptemberSO, 1890.*l

Application filed July 9, 1890., Serial No. 358,208. (No model.)

To all whom t may concern,.- Be it known that I, FREDEEIC'SCHOFE, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Portable Reaming and Tapping Machines, of which the following is a specification.

The object of my invention is to construct a portable reaming and tapping machine that will be simple in construction and that is readily interchangeable and speciallyapplicable to iiexible shafting, the machine being reversible, so that the tool can feed forward or reversed, as fully described hereinafter.

In the accompanying drawings, Figure l is a perspective View of my improved reamer. Fig. 2 is a sectional plan on the line 1 2, Fig. 4. Fig. 3 is a longitudinal section on the line 3 4, Fig. 2. Fig. 4 is an end view looking in the direction of the arrow, Fig. 2. Fig. 5 is a View of a modification of my invention, and Fig. 6 is a View of a tool-carrier.

A is the casing of the machine, made in the peculiar form clearly shown in Fig. 2, and mounted on the casing is a cap A', secured thereto by bolts and screws a a. An extension A2 of the casing forms a bearing for the driving-shaft B and also affords a hand-hold for the operator. On the opposite side of the casing is a handle a', which can be grasped by the operator. .On the outer end of the shaft B is a coupling b for the iiexible shaft (Shownin Fig. l.) On theinner end of this shaft is a gear-Wheel D, which is detachably secured to the shaft. This wheel meshes with a pinion E on the shaft F. The pinion in the present instance is secured to the shaft, and also secured to the shaft is a worm E. In some cases the pinion and worm may be made in a single piece, and when this is the case the worm and pinion need not be secured to the shaft, being merely mounted thereon, or they may form the shaft. Meshing with the worm is a worm-wheel G on aspindle H, which has its bearing in bushing in the casing and in the cap A. This spindle H has inthe presentinstance two tapered orifices h h', as shown in Fig. 3, one extending from one end 0f the spindle and the other extending from the other end of the spindle. To either one of these orifices is adapted the tool ortool-carrier I, Fig. 6, as the case may be.

.used for larger or smaller tools.

The openings I in the tool-carriers are of different diameters, in order to accommodatedifferent-sized heads of tools. The orifices h lines in Fig. 3 and in full lines in Fig. 5) may be Ther sleeves J can be screwed onto the threaded portions of the spindle, as shown.

On each end of the spindle I prefer to place nuts t' t', as clearly shownin Fig. 3. These nuts are for the purpose of forcing the tools or their holders out of the sockets when it is wished to remove them from the machine.

The main shaft B and the spindle H are in line with each other, so that the rotary motion will not affect the. grasp of the'operator.

On removing the cap and replacing the pinion and gear-wheel with wheels of different diameters dierent speeds can be obtained, and in some instances the worm and wormwheel may be changed to worm and worm- Wheels of diiferent pitch.

By the above-described mechanism I am enabled to reduce the high speed of a iiexible shaft to the speed required for reaming or tapping, the parts being simple in construction, and can be readily and accurately made and repaired with very little cost.

The operation of the machine is as follows: The coupling b is secured to the iiexible shaft and tool mounted in one of the spindle-openings h. The machine is then held in the hand in the position shown in Fig. 1, the projections A2 and a being grasped by the operator. After the reamor or tap has been fed forward the machine can be Vturned over and the opening h of the spindle placed over the head of the reamer or tap, and consequently onmotion being applied to the machine the reamer or tap will be reversed and withdrawn.

In Fig. 6 I have shown a solid spindle secured to the worm-wheel and screw-threaded at each end, one end having a right-hand screw and the other end a left-hand screw. Adapted to these screw-threaded ends are hollow tool-carriers or sleeves J, described above, which secure the head of the tool. These carriers are madein a number of sizes for different-sized taps or reamers.

I claim as my inventionI l. The combination, with the portable ream- IOO ing or tapping machine, of` the casing, the shaft B, mounted thereimhaving at its outer end a. coupling for a flexible shaft, a gear- Wheel mounted on said shaft, a longitudinal shaft H, havingapinion and Worm E', said pinion gearingwith said Wheel and aworm-Wheel meshing with said Worm, and a tool-spindle on which the Worm-Wheel is secured, substantially as described.

2. The combination of the Casin g A, the cap A secured thereto, an extension A2, a. driving-shaft mounted in said extension, a handle a opposite said extension A2, a tool-spindle, and gearing connecting said spindle with the driving-shaft, substantially as described.

3, The combination of the casing, the driving-shaft, the Worm-wheehthe Worm,and gearing connecting said Worm-Wheel with the driving-shaft@ spindle onwhich the Worm-Wheel is mounted, and cavities h h in said spindle for the reception of the tool or tool-carrier, substantielly as described.

each end of the spindle, substantially as and 3o for the purpose set forth.

5. The combination, in a reaming or tapping machine, of the spindle, gearing there- Y for, said spindle having its ends screw-threaded, and a tool-carrier adapted to said screwthreaded portion of the spindle, substantially es set forth. Y In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FREDERIC SCHOFF. Vitnesses:

H. F. REARDON, HENRY I-IoWs'oN.y 

